Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens

Table 5

Polynomial fitting equation of dynamic stress intensity factor .

SIF	Fitting equation	b0	b1	b2	b3	b4	b5	b6	b7
		1.583	−0.005	1.094e^−5	6.653e^−8	2e^−10	3e^−13	2e^−16	2e^−20
		0.5792	0.0028	2.745e^−5	1.083e^−7	2e^−10	2e^−13	6e^−17	—